Reviews and Problems with Canon EF 100mm f/2.8 Macro USM
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OU812, B&H Photo
7 October 2013
Excerpt: Mine has been in the shop 5 times for the same problem. Bad Power Diaphragm Unit. It has been used in a studio setting, kept in a padded camera case its whole life. Canon refuses to admit its a lemon !!!!! $ 140.00 a pop !!! CANON CAN YOU READ THIS ?????